臺灣博碩士論文加值系統

封包分類對於現今的網路架構而言是一項非常重要的功能，它可以輔助或提供封包轉送、連線品質管理(QoS)、防火牆、流量控制或虛擬私人網路(VPN)等功能或服務。隨著網路的發展與軟體定義網路(SDN)的出現，傳統上對於五維規則所設計的封包分類方法已不足以使用在現今的十二維或更多維度的規則集上。現今所面對的主要問題是如何處理大於十二維度的規則以及內容數量更多的規則集上並且需要能達到高速的封包分類。為了達到高速分類，目前有部分方法是實作在GPU上，其中有一部分是使用單一Hash Table來處理搜尋( [11] )，另一部分是使用Binary Range Tree來搜尋( [6], [10] )，還有一種是使用Hash-based的方法加上Tuple space ([22])，由於十二維規則集的特性，相對於傳統五維新增的維度皆為單一值或是wildcard，因此前述兩種方法並無法很有效率的處理這種特性的規則集。另一方面的問題是，使用一般GPU運算時，需要將輸入資料及運算結果透過PCI-E匯流排來傳輸於GPU記憶體與主記憶體之間，匯流排的延遲是一個很大的瓶頸。
在此論文中，我們提出了一個變形的Hash表來處理皆為單一值或是wildcard的維度，並且透過壓縮的方法來減少記憶體使用量。另一方面，我們將此方法實作在異質性系統架構的APU上，以此來略過匯流排延遲來移除瓶頸。根據實作在AMD A10-7850 APU上的實驗結果，我們的方法可以在使用12K條的十二維規則集時達到1586到1983 MPPS (Million Packet Per Second)的流量，相較於將相同方法實作於傳統的GPU上，流量有近十倍的改進。相較於實作在FPGA的方法( [3] )增加了約600 MPPS。相較於其他實作於GPU方法( [6], [20] )，流量約有10到40倍的改善。

Packet classification is a very important component for today’s network architecture, it can help or provide packet forwarding, Quality of Service (QoS), firewall, traffic control, or virtual private network (VPN). With the development of Internet and the emergence of software-defined networking (SDN), the methods designed for the traditional 5-dimensional rule set is not efficiently to process the current rule set that contains 12-dimensional or more dimensions rules. The main problem is how to process the rule sets those are 12-dimensional or more dimension and must can achieve high throughput. To achieve high throughput, there are some methods are implemented on GPU, some of them use a single hash table to process the searching ( [11], [21] ), some of anothers use Binary Range Tree to process ( [6], [10], [20] ), and [22] uses hash-based method and tuple space method. Because of the properties of 12-dimensional rule sets, the new 7 fields are all exact value or wildcard, use the single hash table or binary range tree is not efficiently. There is another problem, when use the normal GPU the process computing, we must transfer the input data and results with the PCI-E bus, the bus latency is a big bottleneck.
In this thesis, we propose a modified hash table to process the exact value or wildcard fields, and use the compressing method to reduce memory consumption. In the other hand, we implement this method on APU that uses Heterogeneous System Architecture to skip the bus delay between host and device. According to the experimental result on AMD A10-7850 APU, the throughput of our method can achieve 1586 to 1983 MPPS (Million Packet Per Second) throughput when the rule sets contain 12K 12-dimensional rules. Also the memory consumption of our proposed scheme is 38 MB. The throughput our proposed scheme is 10 times of the throughput of implementing the same method on legacy GPU. The method implemented on FPGA ([3]) can achieve 1250 MPPS, our scheme can achieve higher throughput. The throughput of our scheme is 10 to 40 times of other GPU-based method ([6], [11]).

摘要. i
Abstract . ii
誌謝. iv
TABLE OF CONTENTS . v
LIST OF TABLES. vii
LIST OF FIGURES. viii
Chapter 1 Introduction . 1
Introduction. 1
Organization of the Thesis . 3
Chapter 2 Related work. 4
OpenFlow. 4
2.1.1 Flow Table . 4
2.1.2 OpenFlow Switch components. 6
2.1.3 Flexible Rule Generator (FRuG) . 7
Cuckoo Hashing. 8
Bloom Filter . 9
Accelerated Processing Unit (APU). 9
2.4.1 Heterogeneous System Architecture (HSA) . 12
2.4.2 Heterogeneous Uniform Memory Access (hUMA). 16
2.4.3 Heterogeneous Queuing (hQ). 17
2.4.4 C++ Accelerated Massive Parallelism (C++ AMP). 18
2.4.5 HCC compiler. 19
2.4.6 Low Level Virtual Machine (LLVM) . 19
2.4.7 Clang compiler . 20
Chapter 3 Proposed scheme. 21
Overview. 21
3-Layer Hash Tree. 24
3.2.1 Bloom Filter and Possibility Bitmap . 24
3.2.2 Layer 1. 34
3.2.3 Layer 2. 37
3.2.4 Layer 3. 40
Compress L2 hash table . 44
Cache and MicroFlow table . 48
Update compressed table . 49
Optimize the utilization of Stream Processors (SP Optimize) . 50
Update data structure of Bloom filter phase . 51
Chapter 4 Experimental Result. 53
Experimental Environment . 53
Experimental Result. 56
Chapter 5 Conclusion. 66
References . 67

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